Exchange Online: Unable to access (05/13/2020)

[German]Short status message about the Microsoft Cloud. Currently there are probably login problems with the Microsoft service Exchange Online again. According to a Microsoft report, this probably occurs worldwide.


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Users of Microsoft’s cloud services seem to be affected by issues the last few days, especially when logging on to services. Since the beginning of May 2020, there have been various problems with Exchange Online (see Exchange Online Service disruption (30.4. – 1.5.2020)).

I didn’t follow it up, but then in connection with the article Microsoft Office Patchday (May 5, 2020) I noticed several comments (beneath the German edition of this blog post) complaining about issues with authentication. As of May 11, 2020, I reported in the blog post Outlook authentication issues with Microsoft cloud fixed? that Microsoft believed they had fixed the problem, as a tweet suggests.

Exchange Online: Sign in issues on 13 May

I just received a mail from Andreas P. who sent me status messages from the status portal for Office 365 administrators (thanks for that). There it says:

-13.05.2020 19:47:45

Title: All users may be unable to access the Exchange Online service

User Impact: Users may be unable to sign in to the Exchange Online service.

More info: Users may encounter an error with the following message: “AADSTS50011: The reply URL specified in the request does not match the reply URLs configured for the application: ‘e48d4214-364e-4731-b2b6-47dabf529218′”.

Current status: We’re collecting data on the application referenced in the error message and reviewing internal system telemetry in relation to this problem to isolate the cause.

Scope of impact: This issue may potentially affect any user.

Next update by: Wednesday, May 13, 2020, at 7:00 PM UTC

-13.05.2020 19:24:18

Title: Can’t access the Exchange Online service

User Impact: Users may be unable to sign into the Exchange Online service.

Current status: We’re investigating a potential issue and checking for impact to your organization. We’ll provide an update within 30 minutes.

This means that there are again problems with the Exchange Online login, which end in an error notification. Microsoft is still collecting information via telemetry to determine the cause of the problem.

Problem probably solved

On Twitter, Microsoft says that they found a problem ‘with one of the latest updates’ which is responsible for the login problems


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Currently this update has been deactivated and you can check if there are any changes in the above tweet. At least here comes the promise that everything is working again. Addition: In the meantime Andreas P. has sent the updated status message.

-13.05.2020 21:39:19

Title: All users may be unable to access the Exchange Online service

User Impact: Users may have been unable to sign in to Outlook on the web.

More info: Users may have encountered an error with the following message: “AADSTS50011: The reply URL specified in the request does not match the reply URLs configured for the application: ‘e48d4214-364e-4731-b2b6-47dabf529218′” and/or other general AADSTS errors related to sign-in.

Final status: We’ve completed the rollback of the impacting change successfully and users should now be able to successfully sign in to Outlook on the web.

Scope of impact: This issue may have potentially affected any user.

Start time: Wednesday, May 13, 2020, at 4:22 PM UTC

End time: Wednesday, May 13, 2020, at 6:45 PM UTC

Root cause: A recent change included a code regression that resulted in users experiencing authentication failures.

Next steps:
– We’re reviewing our deployment and provisioning procedures to help prevent similar problems in the future.

We’ll publish a post-incident report within five business days.

Question: Is or was anyone affected?


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